Spidev different ioctl structure

[Sebastian Huber]

Hello Andre,

being compatible to Linux is the goal. If this doesn't work, then this 
is a bug. You can add a ticket for this and fix the issues.

On 12/05/2021 08:36, Andre.Nahrwold at dlr.de wrote:
> I discovered that the Spidev include (linux/spi/spidev.h) contains different implementations of the ioctl structure when comparing rtems and linux.
> I used the mode value of the structure and wanted to compile the application for rtems and linux, that is where I got some errors.
> A few further value names differ also: cs, word_delay_usecs, pad.

I don't think the "pad" member should be used by an application.
> 
> Does anybody now why there is this difference?
> Or is it not necessary to use the mode value for the ioctl commands?
> 
> On rtems it looks like this:
> 
> struct spi_ioc_transfer {
>    void *rx_buf;
>    const void *tx_buf;

Maybe use uintptr_t instead of void *.

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